Any one of numerous species of sand wasps of the genus Sphex and allied genera. These wasps have the abdomen attached to the thorax by a slender pedicel. See Illust. of Sand wasp, under Sand.
sfeks, n. a genus of hymenopterous insects of the family Sphegidæ, closely allied to the true wasps (Vespidæ). [Gr. sph[=e]x, a wasp.]